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                    AJ Utils
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                <h1>MapTool Tutorial</h1>
<p>This tutorial provides an overview of the <code>MapTool</code> class, which is part of the <code>lightweight-component/aj-util</code> library. The <code>MapTool</code> class provides utility methods for working with Map data structures in Java applications.</p>
<h2>Introduction</h2>
<p>The <code>MapTool</code> class contains static methods for common Map operations such as conversion, joining, and XML serialization/deserialization.</p>
<h2>Main Features</h2>
<ul>
<li>Join Map entries into strings with various delimiters</li>
<li>Convert between different Map types and formats</li>
<li>Convert between Maps and XML</li>
<li>Deep copy Maps</li>
<li>Helper methods for Map value processing</li>
</ul>
<h2>Methods</h2>
<h3>1. <code>join()</code> Methods</h3>
<p>Four overloaded methods for joining Map entries into strings:</p>
<ol>
<li><code>join(Map&lt;String, T&gt; map, String div, Function&lt;T, String&gt; fn)</code> - Join with custom delimiter and value processor</li>
<li><code>join(Map&lt;String, T&gt; map, Function&lt;T, String&gt; fn)</code> - Join with default delimiter (&amp;) and custom value processor</li>
<li><code>join(Map&lt;String, T&gt; map, String div)</code> - Join with custom delimiter and default toString() value processor</li>
<li><code>join(Map&lt;String, T&gt; map)</code> - Join with default delimiter (&amp;) and default toString() value processor</li>
</ol>
<h3>2. <code>toMap()</code> Methods</h3>
<p>Two methods for converting to Maps:</p>
<ol>
<li><code>toMap(String[] pairs, Function&lt;String, Object&gt; fn)</code> - Convert array of key=value strings to Map</li>
<li><code>toMap(String[] columns, String[] values, Function&lt;String, Object&gt; fn)</code> - Convert parallel key and value arrays to Map</li>
</ol>
<h3>3. <code>getValue()</code></h3>
<p><code>getValue(Map&lt;String, T&gt; map, String key, Consumer&lt;T&gt; s)</code> - Safely get and process a Map value if present</p>
<h3>4. <code>as()</code> Methods</h3>
<p>Two methods for Map conversion:</p>
<ol>
<li><code>as(Map&lt;String, K&gt; map, Function&lt;K, T&gt; fn)</code> - Convert Map values using a function</li>
<li><code>as(Map&lt;String, String[]&gt; map)</code> - Convert Map with String[] values to Map&lt;String, Object&gt;</li>
</ol>
<h3>5. <code>deepCopy()</code></h3>
<p><code>deepCopy(Map&lt;T, K&gt; map)</code> - Create a deep copy of a Map</p>
<h3>6. XML Conversion Methods</h3>
<ol>
<li><code>beanToXml(Object bean)</code> - Convert Java bean to XML string</li>
<li><code>mapToXml(Map&lt;String, ?&gt; data)</code> - Convert Map to XML string</li>
<li><code>xmlToMap(String strXML)</code> - Convert XML string to Map</li>
</ol>
<h2>Usage Examples</h2>
<h3>Joining Map Entries</h3>
<pre><code class="language-java">Map&lt;String, String&gt; map = new HashMap&lt;&gt;();
map.put(&quot;name&quot;, &quot;John&quot;);
map.put(&quot;age&quot;, &quot;30&quot;);

String joined = MapTool.join(map); // &quot;name=John&amp;age=30&quot;
</code></pre>
<h3>Converting to Map</h3>
<pre><code class="language-java">String[] pairs = {&quot;name=John&quot;, &quot;age=30&quot;};
Map&lt;String, Object&gt; map = MapTool.toMap(pairs, Integer::parseInt);
</code></pre>
<h3>XML Conversion</h3>
<pre><code class="language-java">Map&lt;String, String&gt; data = new HashMap&lt;&gt;();
data.put(&quot;name&quot;, &quot;John&quot;);
data.put(&quot;age&quot;, &quot;30&quot;);

String xml = MapTool.mapToXml(data); 
// &lt;xml&gt;&lt;name&gt;John&lt;/name&gt;&lt;age&gt;30&lt;/age&gt;&lt;/xml&gt;

Map&lt;String, String&gt; map = MapTool.xmlToMap(xml);
</code></pre>
<h2>Conclusion</h2>
<p>The <code>MapTool</code> class provides comprehensive utility methods for working with Map data structures, including joining, conversion, and XML serialization/deserialization.</p>

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